Editing 4K video from the 6s with iMovie, on the 6s sure, but what about on my iPad ???

Have the 6s on order and I know I'll be able to use iMovie on the 6s to do 4K editing but what will happen if I try and load the 4K video into my iPad Air 2 to use with my just updated 2.2 iMovie app ?

Will it work ?
Will my Air 2 even accept the 4K video ?
Or accept the 4K video but down res it to 1080p ?

Yes, I plan on getting the iPad Pro, but until that comes out in November what's the fix or options ?

If you can get the video on the device via a third-party app, I've "heard" it will work.

Well, gave it a shot and no luck, took some 4K video with my Note 4 (3840x2160) got in loaded into my Air 2 with no problem and the video played perfectly on my iPad but iMovie would not acknowledge or recognize the 4K video clip even existing on my iPad.

I did load some 1080p 60fps from my Note 4 into my my Air 2 and that edited perfectly with iMovie.

Ohhh well, looks like I'll have to wait till November for the iPad Pro to do my 4K editing with iMovie.

Until then I guess I'll be editing my 4K stuff on my 6s, or perhaps I'll have to change my order to the 6s Plus so I can have a bigger screen to edit on.